A survey conducted by Harris Interactive on behalf of CareerBuilder found that two in five companies are using social networking sites to research job candidates, up 37% from last year. Of these companies, 43% have found information on social media that has made them decide to not hire a candidate. On the flip side, 19% of survey respondents said they have found information on candidates' social networking profiles that caused the hiring scales to tip in their favor.

The CareerBuilder study was conducted earlier this year among more than 2,100 hiring managers and human resources professionals. Based on their responses, here are five things you should do on social media when in the market for a new position and five things that you should not do -- or stop doing, pronto.

Do

1. Convey a professional image (57% of survey respondents said they hired job candidates based at least in part on the professional image the candidates conveyed on social media).

2. Demonstrate that you are well-rounded and have a range of interests (50%).

1. Post provocative or inappropriate photos or other content (50% of survey respondents said they had declined to hire job candidates at least in part because of questionable content posted on the candidates' social media profiles).

2. Include posts/photos that show drug or alcohol use (48%).

3. Bad-mouth previous employers (33%).

4. Make discriminatory comments of any kind (28%).

5. Get caught in a lie about your qualifications (24%).

CareerBuilder recommends that anyone involved in or thinking about a job search do a Web search on themselves to see what pops up -- on social media sites and otherwise. You can bet hiring managers are doing the same.

In what other ways can social media help or hurt job candidates? How is your company using social media to recruit new employees? Please let us know in the comments section below.

I'm surprised the author didn't include more info on the face-to-face aspect of job hunting. I know that passing large volumes of gas can have a negative effect on the likelihood of receiving an offer.

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